발간논문

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Vol.45, No.10, 550 ~ 556, 2007
Title
Cyclic Softening Behavior in Low Cycle Fatigue of Forged Alloy718
최병학 Byung Hak Choe , 김선주 Sun Ju Kim , 이남혁 Nam Hyuck Lee , 염종택 Jong Taek Yeom , 박노광 Nho Kwang Park , 이재현 Je Hyun Lee , 백운규 U. K. Paik
Abstract
The cyclic softening behavior in low cycle fatigue of disk-forged Alloy718 by direct aged process was investigated at high temperatures of 500℃ and 650℃ It resulted that the softening phenomena during fatigue cycles should be related to precipitates and dislocation behavior in the microstructure of DA Alloy718. The slip bands by shearing matrix were composed of the main deformation mode in both of the an forged and the cyclic tested. The dislocations in the slip bands might get distangled in progressing the repeated cyclic motion, resulting the diffused configuration of the slip band lines. The precipitates of γ″ moreover, have made an appearance of shearing by the dissolved dislocations.
Key Words
Alloy718, cyclic softening, Low cycle fatigue, slip band
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